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' A. W. HALL.

Time Piece.

Patented Feb. 16, 1864.

F'dy Z UNITED STATES PATENT OFFICEQ ALEX. W. HALL, OF NEXV YORK, N.

IMPROVEMENT INTIME-PIECES.

Specification forming part of Letters Patent No. 4 1,617, dated February 16, 186i .To aZZ whom it may concern.-

and I do hereby declare that the following is a full, clear, and eXact description of the same, reference being had to the accompanying drawings, forming a part of this specification, in which Figure 1 represents a face View of a clock constructed according to my invention. Fig. 2 is a transverse central section of one of the disk-hands.

Similar letters of reference in both views indicate corresponding parts.

This invention consists in the employment or use, in place of the ordinary hands of a clock or watch, of dials containing the names of different localities arranged in such relative position toward each other that by the motion of said disk-shaped hands or handdisks on the dial of the clock or watch the 10- cal time of all the placesmarked on the disks can be observed at any moment; also, in the application of two or more sets of hands marked with the names of different localities, and moving on one and the same arbor, in combination with the dial of a clock or watch in such a manner that the local time of each of the places marked on the hands and the difference of time between said places can be observed at a glance whenever desired; finally, in the arrangement of adjustable indexes or local hands inserted into or attached to tothe edge of the hand-disks in such a manner that the same indicate the local time of that place where the watch or clock is to be used.

To enable those skilled in the art to make and use my invention, I will proceed to describe it.

A represents a clock or watch constructed in the ordinary manner. The hour-hand of this clock or watch is replaced by a disk, B. and the minute-hand by a disk, (3. The dial D remains unchanged.

The disk B is secured to the central arbor, a, by friction precisely in the same manner as the hour-hand of an ordinary clock or watch, and it is somewhat larger than the minutedisk 0, as clearly shown in Fig. 1 of the drawings. The minute-disk G is provided with a movable center, I), which is made of metal, and fitted to the square end of the central arbor, a, like an ordinary minute-hand, the disk 0 being secured to the center b, so that it can be rotated independent of the arbor.

The annular space of the hourdisk B, which is visible outside of the minutedisk (3, contains the names of different localities or of the principal places or cities on one hemisphere of the globe, written or otherwise marked on radial lines 0, each of which lines forms the local hand indicating the local time of the place marked near it. As the disk revolves the lines 0 will indicate the relative local time for the differentplaces marked on the hour-disk B, and also the difference of time between said places with such accuracy as the use of the hour-hand ona clock or watch will allow.

In order to effect the same accuracy in my time-piece as in an ordinary clock or watch, the minute-disk G is also provided with a series of radial lines, (1, each of which termi nates with a pointed head or dart, taking the place of the point of the ordinary minutehand, and the names of the localities marked on the hour are also marked on the lines (Z in such relative position toward each other that the line under one of the names of the minute-disk will take the place of the minutehaud and the line under the same name on the hour-disk the place of the hour-hand for the place represented by that name, and the correct time for each of these places can be observed precisely the same as it can on an ordinary watch or clock.

The observation of the time is still further facilitated by the local bands D E, the hand D being inserted into the edge of the hour disk, and the hand E into the edge of the minnute-disk opposite to that place or locality where the time-piece is to be used, said hands and disks being so arranged that the hands can be readily attached opposite to any of the places marked on the disks.

It must be remarked that the lines 0 d, instead of being marked on the disks, might be represented by several sets of hands attached to the same central arbor and marked with the names of the differentlocalities for which the time-piece is to be used.

In the drawings, the local hands are inserted opposite the line market New York on both disks, and they indicate twentyminutes to twelve as the local time for New York. At the same moment the minute-line marked London shows twenty-three minutes, and

the hourline marked London is between at and 5, showing that the local time for Lon* don is twenty-three minutes to five at the moment when it is twenty minutes to twelve in New York, the difference of time between London and New York being four hours and fiftyseven minutes.

It is obvious that the local hands D E can be adjusted for any other place besides New York, and the local time of any of the places marked on the disks and the differenceot' time between said places can be determined in the same manner as above specified.

What I claim as new, and desire to secure y Letters Patent, is-

l. The employment or use of disks B C, in

Place of the ordinary hour and minute hands of a clock or watch, either one or both combined, said disks being marked withradial lines 0 d, and with the names of different 10- calities or places,substantially asherein shown and described, so that by the motion of said disk or disks on the dial of the time-piece the local time and also the difference of time for the different localities can be determined.

2. The use of two or more sets of hands, a d, marked with the names of differentlocalities, and moving on one and the same central arbor, a, of atime-piece, A, in the manner and for the purposes substantially as set forth.

3. The adjustable indexes or local hands D E, in combination with the hour and minute disks B C, of the time-piece A, constructed and operating in the manner and for the purpose substantially as specified.

ALEX. V. HALL.

Vitnesses:

Tnos. S. J. DOUGLAS,

M. M. LIVINGSTON. 

